Method of forming and ejecting die castings



Oct. 5, 1948. L. H. MORlN 2,450,482

METHOD OF FORMING AND EJECTING DIE CASTINGS Filed Aug. 5, 1944 l illill; mum

. NNN OR 100/5 bf Mole/N Patented Oct. 5, 1948 METHOD OF FORMING AND EJECTING DIE CASTINGS Louis H. Morin, Bronx, N. Y., assignor of onehalf to Davis Marinsky, Bronx, N. Y.

Application August 5, 1944, Serial No. 548,259

5 Claims.

This invention relates to the formation of die castings with ejector portions thereon employed to eject the casting from the dies automatically in the separation of said dies. More particularly, the invention relates to the formation of die cast bodies which include product parts and parts to be removed by trimming, wherein the latter parts are so shaped and formed as to provide means for automatically ejecting the cast body from the dies in the separation thereof. The novel features of the invention will be best understood from the following description when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed, and in which the separate parts are designated. by suitable reference characters in each of the views and in which:

Fig. 1 is a diagrammatic sectional view through adjacent surfaces of a. pair of dies showing a cast body formed in the cavities or impressions of the dies.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig.v 3 is a view similar to Fig. 2 showing the dies in a partially open position; and

Fig. 4 is a, perspective view of the cast body as removed from the dies.

In the formation of die castings, it has been the common practice to employ cores and pins in the formation of castings and, further, ejector pins to remove castings from the die cavities or impressions in the separation of the dies.

It is the purpose of my invention to provide a novel method of forming die cast products by including on the product, as cast, or, in other words, on the cast unit or body as formed in the die cavities or impressions what may be termed ejector portions which. will operate to automatically eject the castings from the die cavities and, further, can be utilized as means for picking up and handling castings automatically ejected from the dies.

While my present invention will adapt itself for use in forming a great variety of forms and shapes of castings, in order to illustrate a simple adaptation of the invention, I have shown in the drawing a pair of relatively movable dies l and II for forming a substantially rectangular ringlike product part l2 in registering cavities l3 and I4 on adjacent surfaces of said dies.

The ring-like cast product l2 is shown detached in Fig. 4 of the drawing and comprises similar side walls l5 and I6 joined and spaced by top and bottom walls I! and I 8, top and bottom being in the relationship shown in the accompanying drawing. The walls I! and I8 are of hexagon 2 cross sectional form, as clearly illustrated in Figs. 1 and 2; whereas the walls 55 and it have bevelled inner surfaces as seen, for example, on the surfaces E9 of the wall it and flat outer surface as seen, for example, on the surface 20 of the wall I5.

The walls H3, H5, II and It collectively form what might also be termed a frame and these walls can also be referred to as frame rails or bars.

The dies NJ and H have, on their parting line, a gate passage 2i opening into the cavities i3 and i l, so as to form a removable gate part, as at 22 in Fig. 4 of the drawing which, in this instance, is disposed upon the outer surface 2! of the wall l5.

The cavities l3 and I4 also include supplemental undercut cavities lta and Ma communicating with thecavities l3 and M by registering passages 23 on the parting line of the dies. This construction of the die cavities forms on the final complete die cast unit or body upper and lower ejector portions 24 and 25, the portion 24 joining the wall H in the web 26, whereas the portion 25 joins the wall It in the web 2?. The webs 26 and Z'lprovide a thin wall construction for trimming the portions 2A and 25 from the casting in the operation of trimming the gate 22 therefrom or in otherwise trimming the product part l2.

The ejector portions 25 and 25 comprise pairs of outwardly tapered pins 28, 2a and 36, 3! pref erably all similarly directed with respect to the adjacent faces of the dies. In any event, the pins 28 and 31! have parallel surfaces, as do also the pins 29 and 3!. In the present construction, the upper surfaces of all of these pins operate in conjunction with corresponding surfaces 32 in the cavities Ida, and 33 in the cavities Ma in the automatic ejection of the complete cast body from the dies in moving said dies away from each other in a common plane. In this separating mcvement of the dies, as is illustrated in Fig. 3 of the drawing, the complete cast body is moved downwardly in being automatically ejected from the die cavities. In other words, it will readily appear that, as the dies l0 and I l are separated in a common plane, the surfaces 32 operating upon the upper surfaces of the pins 28 and 30 and the surfaces 33 operating upon the upper surfaces of the pins 29 and 3| will cause the cast body to be ejected from the cavities and moved downwardly until completely discharged from the dies. In this operation of separating the dies, a holder or carrier may be moved between adjacent surfaces of the dies to engage the ejected casting to feed it to a predetermined point, or the casting may simply be dropped into a suitable receiver. It

interfere with or in any way obstruct the free release of a casting from the die cavity or impression. In other words, the surfaces of the product portion and the surfaces of the ejector portions must be so correlated that the casting as a whole frees itself from the respective cavities by the movement dictated by the ejector portions. It will also be apparent that, in many instances, a single ejector portion will be sufficient to eject a casting from the die cavities. It is only when comparatively large bodies are employed that two of these ejector portions will be necessary or desirable. On the other hand, in some instances where the casting may be frail or of thin walled construction, a large ejector of the type and kind disclosed and the use of several of them would be desirable. This would be especially true in some types of materials used in forming die castings. With respect to materials, it will be understood that various kinds of metals or metal alloys can be employed, as well as various plastic material and the invention is generally applicable to the various processes of forming cast Or moulded bodies.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The method of forming and ejecting die castings, which comprises forming in cavities on adjacent surfaces of relatively movable dies a die cast body comprising a product part and integral ejector portions, shaping that part of the die cavities forming the ejector portions in such manner as to form oppositely extending and angularly arranged ejector pins on said portions with common surfaces of the ejector pins of both ejector portions in parallel relationship to each other, and camming the whole die cast bod out of the cavities of both die parts by means of the ejector portions by moving the die parts in engagement with a surface of each ejector portion and at an angle thereto.

2. The method of forming and ejecting die castings, which comprises forming in cavities on adjacent surfaces of relatively movable dies a die cast body comprising a product part and integral ejector portions, shaping that part of the die cavities forming the ejector portions in such manner as to form oppositely extending and angularly arranged ejector pins on said portions with common surfaces of the ejector pins of both ejector portions in parallel relationship to each other, camming the whole die cast body out of the cavities of both die parts by means of the ejector portions by moving the die parts in engagement with a surface of each ejector portion and at an angle thereto, and forming the product part of the cast body with surfaces removable from the die cavities in said automatic ejection of the cast body therefrom.

3. The method of forming die castings for automatic ejection from cavities, of a pair of dies movable toward and from each other in a common plane, which comprises forming in the die cavities castings comprising product parts and integral non-product parts, forming the non-product parts with angularly disposed surfaces and with the surfaces of one non-product part parallel to those of the companion non-product part, and camming the whole die cast body out of the cavities of both die parts by means of the ejector portions by moving the die parts in engagement with a surface of each ejector portion and at an angle thereto.

l. The method of forming die castings for automatic ejection from cavities of a pair of dies movable toward and from each other in a common plane, which comprises forming in the die cavities castings comprising product parts and integral non-product parts, forming the non-product parts with angularly disposed surfaces and with the surfaces of one non-product part parallel to those of the companion non-product part, camming the whole die cast body out of the cavities of both die parts by means of the ejector portions by moving the die parts in engagement with a surface of each ejector portion and at an angle thereto, and forming the surfaces of the product part of the castings to free the die cavities in ejection of said castings.

5. The method of forming castings for automatic ejection from dies movable toward and from each other in a common plane, which comprises forming on adjacent surfaces of a pair of dies a product forming cavit and an undercut ejector part forming cavity communicating with the first cavity, injecting casting material into the dies to form a unitary cast body including said ejector part, then separating the dies in an angular direction with respect to the undercut surfaces of the ejector part.

LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,837,452 Le May Dec. 22, 1931 2,322,908 Poux June 29, 1943 2,360,011 Popp Oct. 10, 1944 

